BETHESDA, Md. – The question of how many is too many now has a straightforward answer.

Bars all over the country — including one in Bethesda — have installed breathalyzer vending machines as a way of informing customers of their driving capabilities.

“There are some women who said, ‘Oh I had two beers,’ and blow into it, and they realized, ‘Oh, I’m actually at a .08, and I never would have guessed it,'” says Kevin Melanson, founder and president of the local distributor 729 Vending.